Focusing on the particular theory of natural law developed by John Finnis and Germain Grisez, this is an introduction to the theory for those who are new to the field. It broadens, assesses and advances the debate surrounding it, examining crucial philosophical, theological and ethical issues. '... when such a sustained attempt at establishing a complete moral theory is made, it is surely to be welcomed... a very worthwhile collection. Arguments are taken seriously, and assessed carefully and eirenically on their merits rather than on their alleged orthodoxy... The editors have done us a service both in their choice of topic for the volume, and in their choice of contributors.' Studies in Christian Ethics '... an interesting systematic treatment...' Themelios 'This book is illuminating, exciting, and fascinating.' Bijdragen, Journal of Philosophy and Theology